<template>
  <view class="uni-swiper__warp">
    <slot />
    <view v-if="mode === 'default'" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box" key="default">
      <view
        v-for="(item, index) in info"
        @click="clickItem(index)"
        :style="{
          width: (index === current ? dots.width * 2 : dots.width) + 'px',
          height: dots.width / 2 + 'px',
          'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
          'border-radius': '0px',
        }"
        :key="index"
        class="uni-swiper__dots-item uni-swiper__dots-bar"
      />
    </view>
    <view v-if="mode === 'dot'" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box" key="dot">
      <view
        v-for="(item, index) in info"
        @click="clickItem(index)"
        :style="{
          width: dots.width + 'px',
          height: dots.height + 'px',
          'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
          border: index !== current ? dots.border : dots.selectedBorder,
        }"
        :key="index"
        class="uni-swiper__dots-item"
      />
    </view>
    <view v-if="mode === 'round'" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box" key="round">
      <view
        v-for="(item, index) in info"
        @click="clickItem(index)"
        :class="[index === current && 'uni-swiper__dots-long']"
        :style="{
          width: (index === current ? dots.width * 3 : dots.width) + 'px',
          height: dots.height + 'px',
          'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
          border: index !== current ? dots.border : dots.selectedBorder,
        }"
        :key="index"
        class="uni-swiper__dots-item"
      />
    </view>
    <view v-if="mode === 'nav'" key="nav" :style="{ 'background-color': dotsStyles.backgroundColor, bottom: '0' }" class="uni-swiper__dots-box uni-swiper__dots-nav">
      <text :style="{ color: dotsStyles.color }" class="uni-swiper__dots-nav-item">{{ current + 1 + "/" + info.length + " " + info[current][field] }}</text>
    </view>
    <view v-if="mode === 'indexes'" key="indexes" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box">
      <view
        v-for="(item, index) in info"
        @click="clickItem(index)"
        :style="{
          width: dots.width + 'px',
          height: dots.height + 'px',
          color: index === current ? dots.selectedColor : dots.color,
          'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
          border: index !== current ? dots.border : dots.selectedBorder,
        }"
        :key="index"
        class="uni-swiper__dots-item uni-swiper__dots-indexes"
        ><text class="uni-swiper__dots-indexes-text">{{ index + 1 }}</text></view
      >
    </view>
  </view>
</template>

<script lang="ts">
/**
 * SwiperDod 轮播图指示点
 * @description 自定义轮播图指示点
 * @tutorial https://ext.dcloud.net.cn/plugin?id=284
 * @property {Number} current 当前指示点索引，必须是通过 `swiper` 的 `change` 事件获取到的 `e.detail.current`
 * @property {String} mode = [default|round|nav|indexes] 指示点的类型
 * 	@value defualt 默认指示点
 * 	@value round 圆形指示点
 * 	@value nav 条形指示点
 * 	@value indexes 索引指示点
 * @property {String} field mode 为 nav 时，显示的内容字段（mode = nav 时必填）
 * @property {String} info 轮播图的数据，通过数组长度决定指示点个数
 * @property {Object} dotsStyles 指示点样式
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */

export default {
  name: "UniSwiperDot",
  emits: ["clickItem"],
  props: {
    info: {
      type: Array,
      default() {
        return [];
      },
    },
    current: {
      type: Number,
      default: 0,
    },
    dotsStyles: {
      type: Object,
      default() {
        return {};
      },
    },
    // 类型 ：default(默认) indexes long nav
    mode: {
      type: String,
      default: "default",
    },
    // 只在 nav 模式下生效，变量名称
    field: {
      type: String,
      default: "",
    },
  },
  data() {
    return {
      dots: {
        width: 6,
        height: 6,
        bottom: 10,
        color: "#fff",
        backgroundColor: "rgba(0, 0, 0, .3)",
        border: "1px rgba(0, 0, 0, .3) solid",
        selectedBackgroundColor: "#333",
        selectedBorder: "1px rgba(0, 0, 0, .9) solid",
      },
    };
  },
  watch: {
    dotsStyles(newVal) {
      this.dots = Object.assign(this.dots, this.dotsStyles);
    },
    mode(newVal) {
      if (newVal === "indexes") {
        this.dots.width = 14;
        this.dots.height = 14;
      } else {
        this.dots.width = 6;
        this.dots.height = 6;
      }
    },
  },
  created() {
    if (this.mode === "indexes") {
      this.dots.width = 12;
      this.dots.height = 12;
    }
    this.dots = Object.assign(this.dots, this.dotsStyles);
  },
  methods: {
    clickItem(index) {
      this.$emit("clickItem", index);
    },
  },
};
</script>

<style lang="scss" scoped>
.uni-swiper__warp {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.uni-swiper__dots-box {
  position: absolute;
  bottom: 10px;
  left: 0;
  right: 0;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

.uni-swiper__dots-item {
  width: 8px;
  border-radius: 100px;
  margin-left: 6px;
  background-color: rgba(0, 0, 0, 0.4);
  /* #ifndef APP-NVUE */
  cursor: pointer;
  /* #endif */
  /* #ifdef H5 */
  // border-width: 5px 0;
  // border-style: solid;
  // border-color: transparent;
  // background-clip: padding-box;
  /* #endif */
  // transition: width 0.2s linear;  不要取消注释，不然会不能变色
}

.uni-swiper__dots-item:first-child {
  margin: 0;
}

.uni-swiper__dots-default {
  border-radius: 100px;
}

.uni-swiper__dots-long {
  border-radius: 50px;
}

.uni-swiper__dots-bar {
  border-radius: 50px;
}

.uni-swiper__dots-nav {
  bottom: 0px;
  // height: 26px;
  padding: 8px 0;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.2);
}

.uni-swiper__dots-nav-item {
  /* overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap; */
  font-size: 14px;
  color: #fff;
  margin: 0 15px;
}

.uni-swiper__dots-indexes {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  // flex: 1;
  justify-content: center;
  align-items: center;
}

.uni-swiper__dots-indexes-text {
  color: #fff;
  font-size: 12px;
  line-height: 14px;
}
</style>
